WARNING: This page is about a different car, the 2007 Pontiac G5 Pursuit, 2007 Pontiac G5, and 2007 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Identifying Servo Return Spring
Courtesy of GENERAL MOTORS CORP.
NOTE:
Remove bolts evenly, to prevent bore damage.
Remove the three servo cover bolts (25).
Remove the servo cover assembly (Lo and Reverse) (73).